Add Claude Code skills test framework

Created automated test suite for testing superpowers skills using
Claude Code CLI in headless mode.

New files:
- tests/claude-code/run-skill-tests.sh - Main test runner
- tests/claude-code/test-helpers.sh - Helper functions for testing
- tests/claude-code/test-subagent-driven-development.sh - First test
- tests/claude-code/README.md - Documentation

Test framework features:
- Run Claude Code with prompts and capture output
- Assertion helpers (contains, not_contains, count, order)
- Test project creation helpers
- Timeout support (default 5 minutes)
- Verbose mode for debugging
- Specific test selection

First test verifies subagent-driven-development skill:
- Skill loading
- Workflow ordering (spec compliance before code quality)
- Self-review requirements
- Plan reading efficiency (read once)
- Spec compliance reviewer skepticism
- Review loops
- Task context provision

Run with: cd tests/claude-code && ./run-skill-tests.sh

tests/claude-code/README.md

@@ -0,0 +1,128 @@
+# Claude Code Skills Tests
+
+Automated tests for superpowers skills using Claude Code CLI.
+
+## Overview
+
+This test suite verifies that skills are loaded correctly and Claude follows them as expected. Tests invoke Claude Code in headless mode (`claude -p`) and verify the behavior.
+
+## Requirements
+
+- Claude Code CLI installed and in PATH (`claude --version` should work)
+- Local superpowers plugin installed (see main README for installation)
+
+## Running Tests
+
+### Run all tests:
+```bash
+./run-skill-tests.sh
+```
+
+### Run specific test:
+```bash
+./run-skill-tests.sh --test test-subagent-driven-development.sh
+```
+
+### Run with verbose output:
+```bash
+./run-skill-tests.sh --verbose
+```
+
+### Set custom timeout (default 300s):
+```bash
+./run-skill-tests.sh --timeout 600
+```
+
+## Test Structure
+
+### test-helpers.sh
+Common functions for skills testing:
+- `run_claude "prompt" [timeout]` - Run Claude with prompt
+- `assert_contains output pattern name` - Verify pattern exists
+- `assert_not_contains output pattern name` - Verify pattern absent
+- `assert_count output pattern count name` - Verify exact count
+- `assert_order output pattern_a pattern_b name` - Verify order
+- `create_test_project` - Create temp test directory
+- `create_test_plan project_dir` - Create sample plan file
+
+### Test Files
+
+Each test file:
+1. Sources `test-helpers.sh`
+2. Runs Claude Code with specific prompts
+3. Verifies expected behavior using assertions
+4. Returns 0 on success, non-zero on failure
+
+## Example Test
+
+```bash
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+source "$SCRIPT_DIR/test-helpers.sh"
+
+echo "=== Test: My Skill ==="
+
+# Ask Claude about the skill
+output=$(run_claude "What does the my-skill skill do?" 30)
+
+# Verify response
+assert_contains "$output" "expected behavior" "Skill describes behavior"
+
+echo "=== All tests passed ==="
+```
+
+## Current Tests
+
+### test-subagent-driven-development.sh
+Tests the updated subagent-driven-development workflow:
+- Skill loading
+- Workflow ordering (spec compliance before code quality)
+- Self-review requirements
+- Plan reading efficiency (read once)
+- Spec compliance reviewer skepticism
+- Review loops
+- Task context provision (full text, not file reading)
+
+## Adding New Tests
+
+1. Create new test file: `test-<skill-name>.sh`
+2. Source test-helpers.sh
+3. Write tests using `run_claude` and assertions
+4. Add to test list in `run-skill-tests.sh`
+5. Make executable: `chmod +x test-<skill-name>.sh`
+
+## Timeout Considerations
+
+- Default timeout: 5 minutes per test
+- Claude Code may take time to respond
+- Adjust with `--timeout` if needed
+- Tests should be focused to avoid long runs
+
+## Debugging Failed Tests
+
+With `--verbose`, you'll see full Claude output:
+```bash
+./run-skill-tests.sh --verbose --test test-subagent-driven-development.sh
+```
+
+Without verbose, only failures show output.
+
+## CI/CD Integration
+
+To run in CI:
+```bash
+# Run with explicit timeout for CI environments
+./run-skill-tests.sh --timeout 900
+
+# Exit code 0 = success, non-zero = failure
+```
+
+## Notes
+
+- Tests verify skill *instructions*, not full execution
+- Full workflow tests would be very slow
+- Focus on verifying key skill requirements
+- Tests should be deterministic
+- Avoid testing implementation details